CVE-2026-39828

Invoking bypass of certificate restrictions in golang.org/x/crypto/ssh

Published: May 22, 2026Updated: Sep 11, 2026 Sources: CVE List NVDCWE-295

6.3MEDIUM

Description

When an SSH server authentication callback returned PartialSuccessError with non-nil Permissions, those permissions were silently discarded, potentially dropping certificate restrictions such as force-command after a second factor succeeded. Returning non-nil Permissions with PartialSuccessError now results in a connection error.

No summary for this CVE yet.

CVSS Vector Breakdown

Exploitability

AV:NAttack Vector

Network

AC:LAttack Complexity

Low

PR:LPrivileges Required

Low

UI:NUser Interaction

None

Scope

S:UScope

Unchanged

Impact

C:LConfidentiality

Low

I:LIntegrity

Low

A:LAvailability

Low

Open in CVSS calculator →

Weaknesses

CWE-295 CWE-281

Affected Products

golang.org/x/crypto

oss-projectaka x/crypto, golang x crypto

golang.org/x/crypto/sshLibrary

oss-project·US

Exploitability

Official Patch Available

Is your org exposed to CVE-2026-39828?Request an assessment to establish which checks are appropriate for your systems. Check my exposure

Attack Graph

Products CVE Techniques Tactics

Click technique nodes for MITRE ATT&CK details · drag to pan · Ctrl/⌘ + scroll to zoom, or go fullscreen.

MITRE ATT&CK

2 techniques

Collection

Privilege Escalation

View detailed technique mapping

References

https://go.dev/issue/79562

go.dev

https://groups.google.com/g/golang-announce/c/a082jnz-LvI

groups.google.com

https://go.dev/cl/781621

go.dev

and 53 more references View all →

Unlock Complete Vulnerability Intelligence

Get the full picture for CVE-2026-39828 and every CVE in our database. Create a free account — no credit card required.

Create Free Account

Plain-language analysis

Impact assessment and exploitation scenario in plain English

Attack graph visualization

Interactive attack path and kill chain mapping

Exploit details & PoC links

ExploitDB, Metasploit, GitHub PoCs with direct links

Nuclei scanner templates

Ready-to-use vulnerability scanner templates

Full remediation guide

Patch instructions, workarounds, and compliance impact

Interactive AI chat

Ask questions about this vulnerability in natural language

Related vulnerabilities

Semantically similar CVEs and attack patterns

REST API & MCP access

Integrate vulnerability data into your workflows